Re: Secondary Construction
Subject: Re: Secondary Construction
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Date: Thu, 5 Oct 1995 09:31:34 +1200
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MW> > Point taken, but...
MW> > Can anyone explain why sparks would prefer to travel down the
MW> >inside of the former (winding) rather than the outside ?
SH> thppppppth! Oh, sorry, had to dust off some neurons. I'd guess
SH> that the magnetic flux density tends to be greater inside the
SH> secondary, and without the added dielectric of the end caps, arc
SH> form more easily.
Thanks for the reply. I am of course aware of the behaviour of
plasmas in magnetic fields (a la Tokamaks, solar prominences, auroras
etc.). The reason I ask is because there is a well known photograph
of one of the MASTER's large coils (in a building) clearly throwing
sparks twice its height, yet without a plastic former, no sparks in-
ternally. The coil is clearly effectively suspended in air.